Update duckdb index files

.gitattributes

@@ -579,3 +579,4 @@ default/raspberrypi.meta/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/quantumcomputing/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/meta.askubuntu/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/musicfans.meta/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/retrocomputing.meta/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/retrocomputing.meta/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a29ff78cc079f52650dc29bd7abf0ff1b959ef0df9dd7677007ee760fa698cc0
+size 4730880